Loading the content... Loading depends on your connection speed!

t8 led

led t8t8 fluorescentt8 bulbt8 lightst8 lampst8 lampt8 lightingt8 lightt8 tube

LED tubes lights fluorescent lamps power supply often thrown 10 kinds of topics!< br>Current, led tubes lights t8 t5 lamps fluorescent market is very active, LED fluorescent lamp LED fluorescent lamp power supply is the most important part, the inappropriate choice of led tubes lights t8 t5 lamps fluorescent can not be cast out of the function, it can not even work properly.< br> 1. Why must constant:< br> Feature large LED semiconductor decision influenced by the environment. For example, elevated temperature, LED current increases, the voltage increases, the LED current will increase. Long-term than the rated current work, will greatly shorten the LED life. The LED is constant at the temperature and voltage changes and other environmental factors, to ensure that the operating current constant.< br> 2, LED fluorescent lamp power supply board match:< br> Some clients to design the light board, find the power, find it difficult to have a suitable power supply, or too much current, the voltage is too small (as I> 350mA, V <40V); or the current is too small, the voltage is too high (eg I < 40mA, V> 180V), the result is severe fever, low efficiency, or the input voltage range is not enough.< br> In fact, choose a string and then the best way to increase the voltage and current on each LED is the same, but the effect of power able to play the best performance. The best way is to communicate and power supply manufacturers, tailored.< br> 3, LED operating current:< br> General LED rated operating current of 20 mA, some plants used to make the design 20 mA, in fact, this current work under very severe fever. After repeated comparison test, 17 mA is designed to be ideal. The total current N-way parallel = 17 * N;< br> 4, LED operating voltage:< br> General LED recommended operating voltage is 3.0-3.5V. Tested large department in 3.125V, 3.125V so according to formula relatively fair. M light bead in series the total voltage = 3.125 * M;< br> 5, led tubes lights t8 t5 lamps fluorescent series-parallel plate with wide voltage:< br> For led tubes lights t8 t5 lamps fluorescent input voltage range in a relatively wide range AC85-265V, then the led tubes lights t8 t5 lamps fluorescent series-parallel plate is very important. Because the current supply is generally non-isolated step-down power, wide voltage, the output voltage should not exceed 72V, the input voltage range of 85-265V can be reached. That is, the serial number no more than 23 strings.< br> Parallel Number not too much, otherwise the operating current is too large, severe fever, and recommended as the 6 8 and 12 and. The total current is not more than 240 mA as well. There is also a wide voltage solution is to first use the L6561 7527 of the voltage raised to 400V, then the buck, equivalent to two switching power supply, cost twice as expensive, this program is no market price is not high.< br> 6, LED series and parallel and PFC power factor and wide voltage relationship:< br> PFC power supply currently on the market, there are three cases: one is dedicated circuit without PFC, PFC which is generally about 0.65; one is passive PFC circuit with a light board horses prepared well, PFC generally about 0.92; also used One is an active-active circuit 7527 6561 do, PFC can reach 0.99, but the cost of this program is twice as expensive than the second option, so more of the second option.< br> For passive PFC circuit: also called valley-fill PFC circuit, its operating voltage range of the AC input voltage is half the peak. If the input is 180V, the peak is 180 * 1.414 = 254V, half the peak voltage is 127V, the buck minus differential pressure 30V, maximum output is 90V, so the maximum number of series 28 led tubes lights t8 t5 lamps fluorescent beads string. Therefore, in order to give relatively high power factor, number of series lamp beads can not be too much, otherwise, would not reach the low voltage requirements.< br> 7, constant current accuracy:< br> Some current precision on the market power of the poor, PT4107 HV9910 BP2808 SMD802 programs available in the market city of love as a constant current of popular programs, error of ¡À 8% or ¡À 10%, constant error is too large. General requirements ¡À 3% on it.< br> 3% error, 6 in parallel, each of the error is about ¡À 0.5%, if it is 12 channels in parallel, each of the error is about ¡À 0.25%, the accuracy is sufficient. Accuracy is too high, the cost will be greatly increased. And in terms of LED, 17 mA and 17.5 mA little effect.< br> 8, isolation non-isolated:< br> Usually made of isolated power such as 15W, led tubes lights t8 t5 lamps fluorescent placed in its transformer bulky, difficult to put in here. Especially for T6 T8 lamp is almost impossible. Generally only do so isolated 15W, 15W more than the few and expensive. So the cost is not high isolation, the general length of the isolation of more mainstream, the volume can be made smaller minimum can achieve high 8 mm. In fact, non-isolated security measures to ensure the non-existent subject.< br> 9, power efficiency:< br> Output power (output voltage * LED output current) input power. This parameter is particularly important, if inefficient means there is a large part of the input power is converted into heat Phi issued to; if it is contained within the tube will produce a very high temperature, coupled with a light efficiency of our LED the amount of the Phi ratio fever, superimposed will produce higher temperatures.< br> Our internal power supply Electronic parts life will be shortened with increasing temperature, so that the power efficiency is to determine the life of the most fundamental factor. Efficiency can not be too low, otherwise the power consumed in the heat too. Generally above 80% on it, nothing more about the efficiency of the lamp plate matching connection.< br> 10, dimensions:< br> Height is a major limiting factor, generally used for tube T6 T8 size requirements ¡Ü9 mm height can not be too high. T10 tube height ¡Ü15 mm. Length can be rather long, but easy to heat.< br>
t8 led bulbst8 led tubet8 led replacementt8 led tubelightt8 led tubest8 led lampsdimmable t8 ledt8 led tubelightst8 led lamp
t8 led